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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef5b83ff8dde6fd3e61e9cf7cf2ae64c2e715d861a2ddaf294fe17abff9e6558' 
  AND token = 'OHvFR/CrMD1OaEXI4ja8OFTlHP6WGHwF/MFO6t813vM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}